<?php
/**
 * +----------------------------------------------------------
 * @desc: Tp5.1 自定义分页类
 * +----------------------------------------------------------
 * @Author Tinywan
 * +----------------------------------------------------------
 */
namespace page;

use think\Paginator;
class Page extends Paginator
{
    /**
     * 上一页按钮
     * @param string $text
     * @return string
     */
    protected function getPreviousButton($text = '< 上一页')
    {
        if ($this->currentPage() <= 1) {
            return $this->getDisabledTextWrapper($text);
        }

        $url = $this->url(
            $this->currentPage() - 1
        );
        return $this->getPageLinkWrapper($url, $text);
    }

    /**
     * 下一页按钮
     * @param string $text
     * @return string
     */
    protected function getNextButton($text = '下一页 >')
    {
        if (!$this->hasMore) {
            return $this->getDisabledTextWrapper($text);
        }
        $url = $this->url($this->currentPage() + 1);
        return $this->getPageLinkWrapper($url, $text);
    }

    /**
     * @Desc: 统计信息
     * @return string
     */
//    protected function info()
//    {
//        return '<li><span>共&nbsp;' . $this->total . '&nbsp;条</span></li>';
//    }
    //统计信息
    protected function info(){
        return "<li><span>" . $this->currentPage . "/" . $this->lastPage . "</span></li>";
    }

    /**
     * 页码按钮
     * @return string
     */
    protected function getLinks()
    {
        if ($this->simple) {
            return '';
        }

        $block = [
            'first' => null,
            'slider' => null,
            'last' => null,
        ];

        $side = 3;
        $window = $side * 2;

        if ($this->lastPage < $window + 6) {
            $block['first'] = $this->getUrlRange(1, $this->lastPage);
        } elseif ($this->currentPage <= $window) {
            $block['first'] = $this->getUrlRange(1, $window + 2);
            $block['last'] = $this->getUrlRange($this->lastPage - 1, $this->lastPage);
        } elseif ($this->currentPage > ($this->lastPage - $window)) {
            $block['first'] = $this->getUrlRange(1, 2);
            $block['last'] = $this->getUrlRange($this->lastPage - ($window + 2), $this->lastPage);
        } else {
            $block['first'] = $this->getUrlRange(1, 2);
            $block['slider'] = $this->getUrlRange($this->currentPage - $side, $this->currentPage + $side);
            $block['last'] = $this->getUrlRange($this->lastPage - 1, $this->lastPage);
        }

        $html = '';

        if (is_array($block['first'])) {
            $html .= $this->getUrlLinks($block['first']);
        }

        if (is_array($block['slider'])) {
            $html .= $this->getDots();
            $html .= $this->getUrlLinks($block['slider']);
        }

        if (is_array($block['last'])) {
            $html .= $this->getDots();
            $html .= $this->getUrlLinks($block['last']);
        }

        return $html;
    }

    /**
     * 渲染分页html
     * @return mixed
     */
    public function render()
    {
        if ($this->hasPages()) {
            if ($this->simple) {
                return sprintf(
                    '%s<div class="pagelist"><ul>%s %s %s</ul></div>',
                    $this->css(),
                    $this->info(),
                    $this->getPreviousButton(),
                    $this->getNextButton()
                );
            } else {
                return sprintf(
                    '%s<div class="pagelist"><ul>%s %s %s</ul></div> ',
                    $this->css(),
                    //$this->getLinks(),
                    $this->getPreviousButton(),
                    $this->info(),
                    $this->getNextButton()
                );
            }
        }
    }

    /**
     * 生成一个可点击的按钮
     *
     * @param string $url
     * @param int $page
     * @return string
     */
    protected function getAvailablePageWrapper($url, $page)
    {
        return '<li><a href="' . htmlentities($url) . '">' . $page . '</a></li>';
    }

    /**
     * 生成一个禁用的按钮
     *
     * @param string $text
     * @return string
     */
    protected function getDisabledTextWrapper($text)
    {
        return '<li class="disabled"><span>' . $text . '</span></li>';
    }

    /**
     * 生成一个激活的按钮
     *
     * @param string $text
     * @return string
     */
    protected function getActivePageWrapper($text)
    {
        return '<li class="active"><span>' . $text . '</span></li>';
    }

    /**
     * 生成省略号按钮
     *
     * @return string
     */
    protected function getDots()
    {
        return $this->getDisabledTextWrapper('...');
    }

    /**
     * 批量生成页码按钮.
     *
     * @param array $urls
     * @return string
     */
    protected function getUrlLinks(array $urls)
    {
        $html = '';
        foreach ($urls as $page => $url) {
            $html .= $this->getPageLinkWrapper($url, $page);
        }
        return $html;
    }

    /**
     * 生成普通页码按钮
     *
     * @param string $url
     * @param int $page
     * @return string
     */
    protected function getPageLinkWrapper($url, $page)
    {
        if ($this->currentPage() == $page) {
            return $this->getActivePageWrapper($page);
        }
        return $this->getAvailablePageWrapper($url, $page);
    }

    protected function css()
    {
        return '  <style type="text/css">
            .pagelist {
                margin-top: 50px;
                margin-bottom: 35px;
            }
            .pagelist ul {
                text-align: center;
                font-size: 0;
            }
            .pagelist ul li {
                display: inline-block;
                margin: 0 15px;
            }
            .pagelist ul li a {
                padding: 9px 15px;
                font-size: 14px;
                display: block;
                background: none;
                color: #333;
                border: 1px solid #e5e5e5;
            }
            .pagelist ul li span {
                padding: 9px 15px;
                font-size: 14px;
                display: block;
                color: #333;
            }
            .pagelist ul li.active a {
                background: #eee;
                color: #333
            }
            .pagelist ul li.active span {
                background: #eee;
                color: #333
            }
            .pagelist ul li.disabled span {
                background: #eee;
                color: #333
            }
            .pagelist ul li.pageprev a, .pagelist ul li.pagenext a {
                background: #eee;
                color: #333
            }
            .pagelist ul li:hover {
                transform: scale(0.95);
            }
        </style>';
    }
}